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Muscles that support the body also modulate forward progression during walking.
May Q Liu1, Frank C Anderson, Marcus G Pandy
1Department of Mechanical Engineering, Stanford University, Stanford, CA, USA.
Journal of Biomechanics
|October 12, 2005
Summary
A small group of muscles drives walking forward and supports the body. Key muscles like vasti, gluteus maximus, soleus, and gastrocnemius contribute to both propulsion and stability during walking.
Area of Science:
- Biomechanics
- Human Locomotion
- Musculoskeletal System
Background:
- Understanding muscle contributions to walking is crucial for rehabilitation and prosthetics.
- Previous studies have not systematically quantified individual muscle roles in forward progression and support.
Purpose of the Study:
- To characterize the specific roles of individual muscles in forward progression and vertical support during walking.
- To identify key muscle groups responsible for maintaining gait stability and momentum.
Main Methods:
- A three-dimensional simulation of walking was used.
- Forces in 54 individual muscles were systematically perturbed.
- Changes in body mass center acceleration (fore-aft and vertical) were computed during the stance phase.
Main Results:
- Muscles providing vertical support (vasti, gluteus maximus) initially slowed forward speed.
- Muscles like soleus and gastrocnemius propelled the body forward in the latter half of stance.
- Gluteus medius significantly contributed to both support and forward progression, particularly during single-limb stance.
Conclusions:
- A limited set of muscles is primarily responsible for the forward progression and support required for normal walking.
- Non-sagittal muscles, such as the gluteus medius, play a significant role in walking dynamics, despite it being a primarily sagittal-plane activity.